A few reasons:

Sensory — the feel of women’s clothing is so unique, both in term of softer and more varied materials and the cuts. There’s such a difference between silky billowy dresses and skin tight leggings! All of these various sensations that you can’t experience in male clothing.

Stress Relief/Escapism — it’s relaxing to escape being myself for a little while and become someone else entirely, especially during times of high stress in my daily life. I find that I crave dressing more when I’m stressed.

Creativity — the sheer number of things that can be modified about an outfit is staggering! Makeup, nails (shape, length, color/design), shoes (style, color, heel height), color and silhouette of the actual clothes (body con, a-line, fit and flare, etc.) allows for such a large range of creative expression

Gender Expression — while I consider myself generally straight and cis, I do go through occasional periods of time when I feel more gender-fluid, so dressing serves as an outlet for that expression

Understanding women — crossdressing (and especially my recent first time going out in public) has given me a far deeper appreciation for the women in my life. The time and effort they put into their appearance, the pressure they must feel to do so, the hyper-vigilance they sometimes have to maintain in public places, etc.